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Peter Anvin" , Ajay Kaher , Alexey Makhalov , Broadcom internal kernel review list , "Peter Zijlstra (Intel)" Subject: [PATCH v4 03/21] x86/paravirt: Remove PARAVIRT_DEBUG config option Date: Thu, 27 Nov 2025 08:08:26 +0100 Message-ID: <20251127070844.21919-4-jgross@suse.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251127070844.21919-1-jgross@suse.com> References: <20251127070844.21919-1-jgross@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCPT_COUNT_TWELVE(0.00)[13]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; R_RATELIMIT(0.00)[to_ip_from(RLkdkdrsxe9hqhhs5ask8616i6)]; DKIM_TRACE(0.00)[suse.com:+] X-Rspamd-Action: no action X-Spam-Flag: NO X-Spam-Score: -3.01 X-Spam-Level: X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Queue-Id: 0494D5BCC4 Content-Type: text/plain; charset="utf-8" The only effect of CONFIG_PARAVIRT_DEBUG set is that instead of doing a call using a NULL pointer a BUG() is being raised. While the BUG() will be a little bit easier to analyse, the call of NULL isn't really that difficult to find the reason for. Remove the config option to make paravirt coding a little bit less annoying. Signed-off-by: Juergen Gross Acked-by: Peter Zijlstra (Intel) --- arch/x86/Kconfig | 7 ------- arch/x86/include/asm/paravirt.h | 1 - arch/x86/include/asm/paravirt_types.h | 8 -------- 3 files changed, 16 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index fa3b616af03a..aa279fec5c1f 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -805,13 +805,6 @@ config PARAVIRT_XXL bool depends on X86_64 =20 -config PARAVIRT_DEBUG - bool "paravirt-ops debugging" - depends on PARAVIRT && DEBUG_KERNEL - help - Enable to debug paravirt_ops internals. Specifically, BUG if - a paravirt_op is missing when it is called. - config PARAVIRT_SPINLOCKS bool "Paravirtualization layer for spinlocks" depends on PARAVIRT && SMP diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravir= t.h index 612b3df65b1b..fd9826397419 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -12,7 +12,6 @@ #include =20 #ifndef __ASSEMBLER__ -#include #include #include #include diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/p= aravirt_types.h index 84cc8c95713b..085095f94f97 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -354,12 +354,6 @@ extern struct paravirt_patch_template pv_ops; #define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11" #endif /* CONFIG_X86_32 */ =20 -#ifdef CONFIG_PARAVIRT_DEBUG -#define PVOP_TEST_NULL(op) BUG_ON(pv_ops.op =3D=3D NULL) -#else -#define PVOP_TEST_NULL(op) ((void)pv_ops.op) -#endif - #define PVOP_RETVAL(rettype) \ ({ unsigned long __mask =3D ~0UL; \ BUILD_BUG_ON(sizeof(rettype) > sizeof(unsigned long)); \ @@ -388,7 +382,6 @@ extern struct paravirt_patch_template pv_ops; #define ____PVOP_CALL(ret, op, call_clbr, extra_clbr, ...) \ ({ \ PVOP_CALL_ARGS; \ - PVOP_TEST_NULL(op); \ asm volatile(ALTERNATIVE(PARAVIRT_CALL, ALT_CALL_INSTR, \ ALT_CALL_ALWAYS) \ : call_clbr, ASM_CALL_CONSTRAINT \ @@ -402,7 +395,6 @@ extern struct paravirt_patch_template pv_ops; extra_clbr, ...) \ ({ \ PVOP_CALL_ARGS; \ - PVOP_TEST_NULL(op); \ asm volatile(ALTERNATIVE_2(PARAVIRT_CALL, \ ALT_CALL_INSTR, ALT_CALL_ALWAYS, \ alt, cond) \ --=20 2.51.0