arch/riscv/errata/sifive/errata.c | 4 ++-- arch/riscv/errata/thead/errata.c | 2 +- arch/riscv/include/asm/patch.h | 3 +-- arch/riscv/kernel/alternative.c | 4 ++-- arch/riscv/kernel/cpufeature.c | 2 +- arch/riscv/kernel/jump_label.c | 2 +- arch/riscv/kernel/patch.c | 24 +----------------------- arch/riscv/net/bpf_jit_core.c | 4 ++-- 8 files changed, 11 insertions(+), 34 deletions(-)
Commit edf2d546bfd6f5c4 ("riscv: patch: Flush the icache right after
patching to avoid illegal insns") removed the last differences between
patch_text_set_nosync() and patch_insn_set(), and between
patch_text_nosync() and patch_insn_write().
So remove the redundant *_nosync() functions.
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Closes: https://lore.kernel.org/linux-riscv/CAMuHMdUwx=rU2MWhFTE6KhYHm64phxx2Y6u05-aBLGfeG5696A@mail.gmail.com/
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
---
arch/riscv/errata/sifive/errata.c | 4 ++--
arch/riscv/errata/thead/errata.c | 2 +-
arch/riscv/include/asm/patch.h | 3 +--
arch/riscv/kernel/alternative.c | 4 ++--
arch/riscv/kernel/cpufeature.c | 2 +-
arch/riscv/kernel/jump_label.c | 2 +-
arch/riscv/kernel/patch.c | 24 +-----------------------
arch/riscv/net/bpf_jit_core.c | 4 ++--
8 files changed, 11 insertions(+), 34 deletions(-)
diff --git a/arch/riscv/errata/sifive/errata.c b/arch/riscv/errata/sifive/errata.c
index 716cfedad3a2..5253b205aa17 100644
--- a/arch/riscv/errata/sifive/errata.c
+++ b/arch/riscv/errata/sifive/errata.c
@@ -112,8 +112,8 @@ void sifive_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
tmp = (1U << alt->patch_id);
if (cpu_req_errata & tmp) {
mutex_lock(&text_mutex);
- patch_text_nosync(ALT_OLD_PTR(alt), ALT_ALT_PTR(alt),
- alt->alt_len);
+ patch_insn_write(ALT_OLD_PTR(alt), ALT_ALT_PTR(alt),
+ alt->alt_len);
mutex_unlock(&text_mutex);
cpu_apply_errata |= tmp;
}
diff --git a/arch/riscv/errata/thead/errata.c b/arch/riscv/errata/thead/errata.c
index bf6a0a6318ee..0ce280a190b6 100644
--- a/arch/riscv/errata/thead/errata.c
+++ b/arch/riscv/errata/thead/errata.c
@@ -182,7 +182,7 @@ void thead_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
memcpy(oldptr, altptr, alt->alt_len);
} else {
mutex_lock(&text_mutex);
- patch_text_nosync(oldptr, altptr, alt->alt_len);
+ patch_insn_write(oldptr, altptr, alt->alt_len);
mutex_unlock(&text_mutex);
}
}
diff --git a/arch/riscv/include/asm/patch.h b/arch/riscv/include/asm/patch.h
index 9f5d6e14c405..6b0e9b8a321b 100644
--- a/arch/riscv/include/asm/patch.h
+++ b/arch/riscv/include/asm/patch.h
@@ -6,9 +6,8 @@
#ifndef _ASM_RISCV_PATCH_H
#define _ASM_RISCV_PATCH_H
+int patch_insn_set(void *addr, u8 c, size_t len);
int patch_insn_write(void *addr, const void *insn, size_t len);
-int patch_text_nosync(void *addr, const void *insns, size_t len);
-int patch_text_set_nosync(void *addr, u8 c, size_t len);
int patch_text(void *addr, u32 *insns, int ninsns);
extern int riscv_patch_in_stop_machine;
diff --git a/arch/riscv/kernel/alternative.c b/arch/riscv/kernel/alternative.c
index 0128b161bfda..a8b508d99cf8 100644
--- a/arch/riscv/kernel/alternative.c
+++ b/arch/riscv/kernel/alternative.c
@@ -83,7 +83,7 @@ static void riscv_alternative_fix_auipc_jalr(void *ptr, u32 auipc_insn,
riscv_insn_insert_utype_itype_imm(&call[0], &call[1], imm);
/* patch the call place again */
- patch_text_nosync(ptr, call, sizeof(u32) * 2);
+ patch_insn_write(ptr, call, sizeof(u32) * 2);
}
static void riscv_alternative_fix_jal(void *ptr, u32 jal_insn, int patch_offset)
@@ -98,7 +98,7 @@ static void riscv_alternative_fix_jal(void *ptr, u32 jal_insn, int patch_offset)
riscv_insn_insert_jtype_imm(&jal_insn, imm);
/* patch the call place again */
- patch_text_nosync(ptr, &jal_insn, sizeof(u32));
+ patch_insn_write(ptr, &jal_insn, sizeof(u32));
}
void riscv_alternative_fix_offsets(void *alt_ptr, unsigned int len,
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 5ef48cb20ee1..4c040a857c7e 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -795,7 +795,7 @@ void __init_or_module riscv_cpufeature_patch_func(struct alt_entry *begin,
altptr = ALT_ALT_PTR(alt);
mutex_lock(&text_mutex);
- patch_text_nosync(oldptr, altptr, alt->alt_len);
+ patch_insn_write(oldptr, altptr, alt->alt_len);
riscv_alternative_fix_offsets(oldptr, alt->alt_len, oldptr - altptr);
mutex_unlock(&text_mutex);
}
diff --git a/arch/riscv/kernel/jump_label.c b/arch/riscv/kernel/jump_label.c
index e6694759dbd0..74b5ebfacf4a 100644
--- a/arch/riscv/kernel/jump_label.c
+++ b/arch/riscv/kernel/jump_label.c
@@ -36,6 +36,6 @@ void arch_jump_label_transform(struct jump_entry *entry,
}
mutex_lock(&text_mutex);
- patch_text_nosync(addr, &insn, sizeof(insn));
+ patch_insn_write(addr, &insn, sizeof(insn));
mutex_unlock(&text_mutex);
}
diff --git a/arch/riscv/kernel/patch.c b/arch/riscv/kernel/patch.c
index ab03732d06c4..bf45b507f900 100644
--- a/arch/riscv/kernel/patch.c
+++ b/arch/riscv/kernel/patch.c
@@ -177,7 +177,7 @@ static int __patch_insn_write(void *addr, const void *insn, size_t len)
NOKPROBE_SYMBOL(__patch_insn_write);
#endif /* CONFIG_MMU */
-static int patch_insn_set(void *addr, u8 c, size_t len)
+int patch_insn_set(void *addr, u8 c, size_t len)
{
size_t patched = 0;
size_t size;
@@ -198,17 +198,6 @@ static int patch_insn_set(void *addr, u8 c, size_t len)
}
NOKPROBE_SYMBOL(patch_insn_set);
-int patch_text_set_nosync(void *addr, u8 c, size_t len)
-{
- u32 *tp = addr;
- int ret;
-
- ret = patch_insn_set(tp, c, len);
-
- return ret;
-}
-NOKPROBE_SYMBOL(patch_text_set_nosync);
-
int patch_insn_write(void *addr, const void *insn, size_t len)
{
size_t patched = 0;
@@ -230,17 +219,6 @@ int patch_insn_write(void *addr, const void *insn, size_t len)
}
NOKPROBE_SYMBOL(patch_insn_write);
-int patch_text_nosync(void *addr, const void *insns, size_t len)
-{
- u32 *tp = addr;
- int ret;
-
- ret = patch_insn_write(tp, insns, len);
-
- return ret;
-}
-NOKPROBE_SYMBOL(patch_text_nosync);
-
static int patch_text_cb(void *data)
{
struct patch_insn *patch = data;
diff --git a/arch/riscv/net/bpf_jit_core.c b/arch/riscv/net/bpf_jit_core.c
index 0a96abdaca65..b053ae5c4191 100644
--- a/arch/riscv/net/bpf_jit_core.c
+++ b/arch/riscv/net/bpf_jit_core.c
@@ -226,7 +226,7 @@ void *bpf_arch_text_copy(void *dst, void *src, size_t len)
int ret;
mutex_lock(&text_mutex);
- ret = patch_text_nosync(dst, src, len);
+ ret = patch_insn_write(dst, src, len);
mutex_unlock(&text_mutex);
if (ret)
@@ -240,7 +240,7 @@ int bpf_arch_text_invalidate(void *dst, size_t len)
int ret;
mutex_lock(&text_mutex);
- ret = patch_text_set_nosync(dst, 0, len);
+ ret = patch_insn_set(dst, 0, len);
mutex_unlock(&text_mutex);
return ret;
--
2.39.2Hi Alex,
On 2024-07-17 3:41 AM, Alexandre Ghiti wrote:
> Commit edf2d546bfd6f5c4 ("riscv: patch: Flush the icache right after
> patching to avoid illegal insns") removed the last differences between
> patch_text_set_nosync() and patch_insn_set(), and between
> patch_text_nosync() and patch_insn_write().
>
> So remove the redundant *_nosync() functions.
My understanding was that we would eventually revert that patch, once we are
sure we never non-atomically patch the text patching code. So it's helpful to
keep the semantic distinction between the two sets of functions.
And looking at this closer, I think the original patch should not have removed
the calls to flush_icache_range() anyway. It replaces a global icache flush with
a local icache flush, which is wrong if there is more than one CPU online, and
there are a couple of places (bpf_jit_core.c, kprobes.c) where those functions
are called at runtime.
Regards,
Samuel
> Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Closes: https://lore.kernel.org/linux-riscv/CAMuHMdUwx=rU2MWhFTE6KhYHm64phxx2Y6u05-aBLGfeG5696A@mail.gmail.com/
> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
> ---
> arch/riscv/errata/sifive/errata.c | 4 ++--
> arch/riscv/errata/thead/errata.c | 2 +-
> arch/riscv/include/asm/patch.h | 3 +--
> arch/riscv/kernel/alternative.c | 4 ++--
> arch/riscv/kernel/cpufeature.c | 2 +-
> arch/riscv/kernel/jump_label.c | 2 +-
> arch/riscv/kernel/patch.c | 24 +-----------------------
> arch/riscv/net/bpf_jit_core.c | 4 ++--
> 8 files changed, 11 insertions(+), 34 deletions(-)
>
> diff --git a/arch/riscv/errata/sifive/errata.c b/arch/riscv/errata/sifive/errata.c
> index 716cfedad3a2..5253b205aa17 100644
> --- a/arch/riscv/errata/sifive/errata.c
> +++ b/arch/riscv/errata/sifive/errata.c
> @@ -112,8 +112,8 @@ void sifive_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
> tmp = (1U << alt->patch_id);
> if (cpu_req_errata & tmp) {
> mutex_lock(&text_mutex);
> - patch_text_nosync(ALT_OLD_PTR(alt), ALT_ALT_PTR(alt),
> - alt->alt_len);
> + patch_insn_write(ALT_OLD_PTR(alt), ALT_ALT_PTR(alt),
> + alt->alt_len);
> mutex_unlock(&text_mutex);
> cpu_apply_errata |= tmp;
> }
> diff --git a/arch/riscv/errata/thead/errata.c b/arch/riscv/errata/thead/errata.c
> index bf6a0a6318ee..0ce280a190b6 100644
> --- a/arch/riscv/errata/thead/errata.c
> +++ b/arch/riscv/errata/thead/errata.c
> @@ -182,7 +182,7 @@ void thead_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
> memcpy(oldptr, altptr, alt->alt_len);
> } else {
> mutex_lock(&text_mutex);
> - patch_text_nosync(oldptr, altptr, alt->alt_len);
> + patch_insn_write(oldptr, altptr, alt->alt_len);
> mutex_unlock(&text_mutex);
> }
> }
> diff --git a/arch/riscv/include/asm/patch.h b/arch/riscv/include/asm/patch.h
> index 9f5d6e14c405..6b0e9b8a321b 100644
> --- a/arch/riscv/include/asm/patch.h
> +++ b/arch/riscv/include/asm/patch.h
> @@ -6,9 +6,8 @@
> #ifndef _ASM_RISCV_PATCH_H
> #define _ASM_RISCV_PATCH_H
>
> +int patch_insn_set(void *addr, u8 c, size_t len);
> int patch_insn_write(void *addr, const void *insn, size_t len);
> -int patch_text_nosync(void *addr, const void *insns, size_t len);
> -int patch_text_set_nosync(void *addr, u8 c, size_t len);
> int patch_text(void *addr, u32 *insns, int ninsns);
>
> extern int riscv_patch_in_stop_machine;
> diff --git a/arch/riscv/kernel/alternative.c b/arch/riscv/kernel/alternative.c
> index 0128b161bfda..a8b508d99cf8 100644
> --- a/arch/riscv/kernel/alternative.c
> +++ b/arch/riscv/kernel/alternative.c
> @@ -83,7 +83,7 @@ static void riscv_alternative_fix_auipc_jalr(void *ptr, u32 auipc_insn,
> riscv_insn_insert_utype_itype_imm(&call[0], &call[1], imm);
>
> /* patch the call place again */
> - patch_text_nosync(ptr, call, sizeof(u32) * 2);
> + patch_insn_write(ptr, call, sizeof(u32) * 2);
> }
>
> static void riscv_alternative_fix_jal(void *ptr, u32 jal_insn, int patch_offset)
> @@ -98,7 +98,7 @@ static void riscv_alternative_fix_jal(void *ptr, u32 jal_insn, int patch_offset)
> riscv_insn_insert_jtype_imm(&jal_insn, imm);
>
> /* patch the call place again */
> - patch_text_nosync(ptr, &jal_insn, sizeof(u32));
> + patch_insn_write(ptr, &jal_insn, sizeof(u32));
> }
>
> void riscv_alternative_fix_offsets(void *alt_ptr, unsigned int len,
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index 5ef48cb20ee1..4c040a857c7e 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -795,7 +795,7 @@ void __init_or_module riscv_cpufeature_patch_func(struct alt_entry *begin,
> altptr = ALT_ALT_PTR(alt);
>
> mutex_lock(&text_mutex);
> - patch_text_nosync(oldptr, altptr, alt->alt_len);
> + patch_insn_write(oldptr, altptr, alt->alt_len);
> riscv_alternative_fix_offsets(oldptr, alt->alt_len, oldptr - altptr);
> mutex_unlock(&text_mutex);
> }
> diff --git a/arch/riscv/kernel/jump_label.c b/arch/riscv/kernel/jump_label.c
> index e6694759dbd0..74b5ebfacf4a 100644
> --- a/arch/riscv/kernel/jump_label.c
> +++ b/arch/riscv/kernel/jump_label.c
> @@ -36,6 +36,6 @@ void arch_jump_label_transform(struct jump_entry *entry,
> }
>
> mutex_lock(&text_mutex);
> - patch_text_nosync(addr, &insn, sizeof(insn));
> + patch_insn_write(addr, &insn, sizeof(insn));
> mutex_unlock(&text_mutex);
> }
> diff --git a/arch/riscv/kernel/patch.c b/arch/riscv/kernel/patch.c
> index ab03732d06c4..bf45b507f900 100644
> --- a/arch/riscv/kernel/patch.c
> +++ b/arch/riscv/kernel/patch.c
> @@ -177,7 +177,7 @@ static int __patch_insn_write(void *addr, const void *insn, size_t len)
> NOKPROBE_SYMBOL(__patch_insn_write);
> #endif /* CONFIG_MMU */
>
> -static int patch_insn_set(void *addr, u8 c, size_t len)
> +int patch_insn_set(void *addr, u8 c, size_t len)
> {
> size_t patched = 0;
> size_t size;
> @@ -198,17 +198,6 @@ static int patch_insn_set(void *addr, u8 c, size_t len)
> }
> NOKPROBE_SYMBOL(patch_insn_set);
>
> -int patch_text_set_nosync(void *addr, u8 c, size_t len)
> -{
> - u32 *tp = addr;
> - int ret;
> -
> - ret = patch_insn_set(tp, c, len);
> -
> - return ret;
> -}
> -NOKPROBE_SYMBOL(patch_text_set_nosync);
> -
> int patch_insn_write(void *addr, const void *insn, size_t len)
> {
> size_t patched = 0;
> @@ -230,17 +219,6 @@ int patch_insn_write(void *addr, const void *insn, size_t len)
> }
> NOKPROBE_SYMBOL(patch_insn_write);
>
> -int patch_text_nosync(void *addr, const void *insns, size_t len)
> -{
> - u32 *tp = addr;
> - int ret;
> -
> - ret = patch_insn_write(tp, insns, len);
> -
> - return ret;
> -}
> -NOKPROBE_SYMBOL(patch_text_nosync);
> -
> static int patch_text_cb(void *data)
> {
> struct patch_insn *patch = data;
> diff --git a/arch/riscv/net/bpf_jit_core.c b/arch/riscv/net/bpf_jit_core.c
> index 0a96abdaca65..b053ae5c4191 100644
> --- a/arch/riscv/net/bpf_jit_core.c
> +++ b/arch/riscv/net/bpf_jit_core.c
> @@ -226,7 +226,7 @@ void *bpf_arch_text_copy(void *dst, void *src, size_t len)
> int ret;
>
> mutex_lock(&text_mutex);
> - ret = patch_text_nosync(dst, src, len);
> + ret = patch_insn_write(dst, src, len);
> mutex_unlock(&text_mutex);
>
> if (ret)
> @@ -240,7 +240,7 @@ int bpf_arch_text_invalidate(void *dst, size_t len)
> int ret;
>
> mutex_lock(&text_mutex);
> - ret = patch_text_set_nosync(dst, 0, len);
> + ret = patch_insn_set(dst, 0, len);
> mutex_unlock(&text_mutex);
>
> return ret;
On Fri, Jul 19, 2024 at 3:56 AM Samuel Holland
<samuel.holland@sifive.com> wrote:
>
> Hi Alex,
>
> On 2024-07-17 3:41 AM, Alexandre Ghiti wrote:
> > Commit edf2d546bfd6f5c4 ("riscv: patch: Flush the icache right after
> > patching to avoid illegal insns") removed the last differences between
> > patch_text_set_nosync() and patch_insn_set(), and between
> > patch_text_nosync() and patch_insn_write().
> >
> > So remove the redundant *_nosync() functions.
>
> My understanding was that we would eventually revert that patch, once we are
> sure we never non-atomically patch the text patching code. So it's helpful to
> keep the semantic distinction between the two sets of functions.
>
> And looking at this closer, I think the original patch should not have removed
> the calls to flush_icache_range() anyway. It replaces a global icache flush with
> a local icache flush, which is wrong if there is more than one CPU online, and
> there are a couple of places (bpf_jit_core.c, kprobes.c) where those functions
> are called at runtime.
Ouch, thanks for catching this, I agree the global icache flush should
not have been removed.
I'll fix that right now,
Thanks,
Alex
>
> Regards,
> Samuel
>
> > Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
> > Closes: https://lore.kernel.org/linux-riscv/CAMuHMdUwx=rU2MWhFTE6KhYHm64phxx2Y6u05-aBLGfeG5696A@mail.gmail.com/
> > Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
> > ---
> > arch/riscv/errata/sifive/errata.c | 4 ++--
> > arch/riscv/errata/thead/errata.c | 2 +-
> > arch/riscv/include/asm/patch.h | 3 +--
> > arch/riscv/kernel/alternative.c | 4 ++--
> > arch/riscv/kernel/cpufeature.c | 2 +-
> > arch/riscv/kernel/jump_label.c | 2 +-
> > arch/riscv/kernel/patch.c | 24 +-----------------------
> > arch/riscv/net/bpf_jit_core.c | 4 ++--
> > 8 files changed, 11 insertions(+), 34 deletions(-)
> >
> > diff --git a/arch/riscv/errata/sifive/errata.c b/arch/riscv/errata/sifive/errata.c
> > index 716cfedad3a2..5253b205aa17 100644
> > --- a/arch/riscv/errata/sifive/errata.c
> > +++ b/arch/riscv/errata/sifive/errata.c
> > @@ -112,8 +112,8 @@ void sifive_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
> > tmp = (1U << alt->patch_id);
> > if (cpu_req_errata & tmp) {
> > mutex_lock(&text_mutex);
> > - patch_text_nosync(ALT_OLD_PTR(alt), ALT_ALT_PTR(alt),
> > - alt->alt_len);
> > + patch_insn_write(ALT_OLD_PTR(alt), ALT_ALT_PTR(alt),
> > + alt->alt_len);
> > mutex_unlock(&text_mutex);
> > cpu_apply_errata |= tmp;
> > }
> > diff --git a/arch/riscv/errata/thead/errata.c b/arch/riscv/errata/thead/errata.c
> > index bf6a0a6318ee..0ce280a190b6 100644
> > --- a/arch/riscv/errata/thead/errata.c
> > +++ b/arch/riscv/errata/thead/errata.c
> > @@ -182,7 +182,7 @@ void thead_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
> > memcpy(oldptr, altptr, alt->alt_len);
> > } else {
> > mutex_lock(&text_mutex);
> > - patch_text_nosync(oldptr, altptr, alt->alt_len);
> > + patch_insn_write(oldptr, altptr, alt->alt_len);
> > mutex_unlock(&text_mutex);
> > }
> > }
> > diff --git a/arch/riscv/include/asm/patch.h b/arch/riscv/include/asm/patch.h
> > index 9f5d6e14c405..6b0e9b8a321b 100644
> > --- a/arch/riscv/include/asm/patch.h
> > +++ b/arch/riscv/include/asm/patch.h
> > @@ -6,9 +6,8 @@
> > #ifndef _ASM_RISCV_PATCH_H
> > #define _ASM_RISCV_PATCH_H
> >
> > +int patch_insn_set(void *addr, u8 c, size_t len);
> > int patch_insn_write(void *addr, const void *insn, size_t len);
> > -int patch_text_nosync(void *addr, const void *insns, size_t len);
> > -int patch_text_set_nosync(void *addr, u8 c, size_t len);
> > int patch_text(void *addr, u32 *insns, int ninsns);
> >
> > extern int riscv_patch_in_stop_machine;
> > diff --git a/arch/riscv/kernel/alternative.c b/arch/riscv/kernel/alternative.c
> > index 0128b161bfda..a8b508d99cf8 100644
> > --- a/arch/riscv/kernel/alternative.c
> > +++ b/arch/riscv/kernel/alternative.c
> > @@ -83,7 +83,7 @@ static void riscv_alternative_fix_auipc_jalr(void *ptr, u32 auipc_insn,
> > riscv_insn_insert_utype_itype_imm(&call[0], &call[1], imm);
> >
> > /* patch the call place again */
> > - patch_text_nosync(ptr, call, sizeof(u32) * 2);
> > + patch_insn_write(ptr, call, sizeof(u32) * 2);
> > }
> >
> > static void riscv_alternative_fix_jal(void *ptr, u32 jal_insn, int patch_offset)
> > @@ -98,7 +98,7 @@ static void riscv_alternative_fix_jal(void *ptr, u32 jal_insn, int patch_offset)
> > riscv_insn_insert_jtype_imm(&jal_insn, imm);
> >
> > /* patch the call place again */
> > - patch_text_nosync(ptr, &jal_insn, sizeof(u32));
> > + patch_insn_write(ptr, &jal_insn, sizeof(u32));
> > }
> >
> > void riscv_alternative_fix_offsets(void *alt_ptr, unsigned int len,
> > diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> > index 5ef48cb20ee1..4c040a857c7e 100644
> > --- a/arch/riscv/kernel/cpufeature.c
> > +++ b/arch/riscv/kernel/cpufeature.c
> > @@ -795,7 +795,7 @@ void __init_or_module riscv_cpufeature_patch_func(struct alt_entry *begin,
> > altptr = ALT_ALT_PTR(alt);
> >
> > mutex_lock(&text_mutex);
> > - patch_text_nosync(oldptr, altptr, alt->alt_len);
> > + patch_insn_write(oldptr, altptr, alt->alt_len);
> > riscv_alternative_fix_offsets(oldptr, alt->alt_len, oldptr - altptr);
> > mutex_unlock(&text_mutex);
> > }
> > diff --git a/arch/riscv/kernel/jump_label.c b/arch/riscv/kernel/jump_label.c
> > index e6694759dbd0..74b5ebfacf4a 100644
> > --- a/arch/riscv/kernel/jump_label.c
> > +++ b/arch/riscv/kernel/jump_label.c
> > @@ -36,6 +36,6 @@ void arch_jump_label_transform(struct jump_entry *entry,
> > }
> >
> > mutex_lock(&text_mutex);
> > - patch_text_nosync(addr, &insn, sizeof(insn));
> > + patch_insn_write(addr, &insn, sizeof(insn));
> > mutex_unlock(&text_mutex);
> > }
> > diff --git a/arch/riscv/kernel/patch.c b/arch/riscv/kernel/patch.c
> > index ab03732d06c4..bf45b507f900 100644
> > --- a/arch/riscv/kernel/patch.c
> > +++ b/arch/riscv/kernel/patch.c
> > @@ -177,7 +177,7 @@ static int __patch_insn_write(void *addr, const void *insn, size_t len)
> > NOKPROBE_SYMBOL(__patch_insn_write);
> > #endif /* CONFIG_MMU */
> >
> > -static int patch_insn_set(void *addr, u8 c, size_t len)
> > +int patch_insn_set(void *addr, u8 c, size_t len)
> > {
> > size_t patched = 0;
> > size_t size;
> > @@ -198,17 +198,6 @@ static int patch_insn_set(void *addr, u8 c, size_t len)
> > }
> > NOKPROBE_SYMBOL(patch_insn_set);
> >
> > -int patch_text_set_nosync(void *addr, u8 c, size_t len)
> > -{
> > - u32 *tp = addr;
> > - int ret;
> > -
> > - ret = patch_insn_set(tp, c, len);
> > -
> > - return ret;
> > -}
> > -NOKPROBE_SYMBOL(patch_text_set_nosync);
> > -
> > int patch_insn_write(void *addr, const void *insn, size_t len)
> > {
> > size_t patched = 0;
> > @@ -230,17 +219,6 @@ int patch_insn_write(void *addr, const void *insn, size_t len)
> > }
> > NOKPROBE_SYMBOL(patch_insn_write);
> >
> > -int patch_text_nosync(void *addr, const void *insns, size_t len)
> > -{
> > - u32 *tp = addr;
> > - int ret;
> > -
> > - ret = patch_insn_write(tp, insns, len);
> > -
> > - return ret;
> > -}
> > -NOKPROBE_SYMBOL(patch_text_nosync);
> > -
> > static int patch_text_cb(void *data)
> > {
> > struct patch_insn *patch = data;
> > diff --git a/arch/riscv/net/bpf_jit_core.c b/arch/riscv/net/bpf_jit_core.c
> > index 0a96abdaca65..b053ae5c4191 100644
> > --- a/arch/riscv/net/bpf_jit_core.c
> > +++ b/arch/riscv/net/bpf_jit_core.c
> > @@ -226,7 +226,7 @@ void *bpf_arch_text_copy(void *dst, void *src, size_t len)
> > int ret;
> >
> > mutex_lock(&text_mutex);
> > - ret = patch_text_nosync(dst, src, len);
> > + ret = patch_insn_write(dst, src, len);
> > mutex_unlock(&text_mutex);
> >
> > if (ret)
> > @@ -240,7 +240,7 @@ int bpf_arch_text_invalidate(void *dst, size_t len)
> > int ret;
> >
> > mutex_lock(&text_mutex);
> > - ret = patch_text_set_nosync(dst, 0, len);
> > + ret = patch_insn_set(dst, 0, len);
> > mutex_unlock(&text_mutex);
> >
> > return ret;
>
On Wed, Jul 17, 2024 at 10:41:02AM GMT, Alexandre Ghiti wrote:
> Commit edf2d546bfd6f5c4 ("riscv: patch: Flush the icache right after
> patching to avoid illegal insns") removed the last differences between
> patch_text_set_nosync() and patch_insn_set(), and between
> patch_text_nosync() and patch_insn_write().
>
> So remove the redundant *_nosync() functions.
>
> Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Closes: https://lore.kernel.org/linux-riscv/CAMuHMdUwx=rU2MWhFTE6KhYHm64phxx2Y6u05-aBLGfeG5696A@mail.gmail.com/
> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
> ---
> arch/riscv/errata/sifive/errata.c | 4 ++--
> arch/riscv/errata/thead/errata.c | 2 +-
> arch/riscv/include/asm/patch.h | 3 +--
> arch/riscv/kernel/alternative.c | 4 ++--
> arch/riscv/kernel/cpufeature.c | 2 +-
> arch/riscv/kernel/jump_label.c | 2 +-
> arch/riscv/kernel/patch.c | 24 +-----------------------
> arch/riscv/net/bpf_jit_core.c | 4 ++--
> 8 files changed, 11 insertions(+), 34 deletions(-)
>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
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