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Sat, 07 Feb 2026 02:28:22 -0800 (PST) From: Guodong Xu Date: Sat, 07 Feb 2026 18:27:57 +0800 Subject: [PATCH 3/8] riscv: cpufeature: Enforce Ziccrse dependency on Zalrsc Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260207-isa-ext-parse-export-v1-3-a64d3a8bc20a@riscstar.com> References: <20260207-isa-ext-parse-export-v1-0-a64d3a8bc20a@riscstar.com> In-Reply-To: <20260207-isa-ext-parse-export-v1-0-a64d3a8bc20a@riscstar.com> To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Jonathan Corbet , Shuah Khan , Conor Dooley Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Guodong Xu X-Mailer: b4 0.14.2 Ziccrse guarantees RsrvEventual for cacheable coherent main memory, a property that is only meaningful when LR/SC instructions are present. Since Zalrsc is the extension that provides LR/SC (also implied by A), add a validation callback to enforce this dependency. Introduce riscv_ext_zalrsc_depends() following the naming convention used by other pure dependency checks like riscv_ext_f_depends(). Signed-off-by: Guodong Xu --- arch/riscv/kernel/cpufeature.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index 3d3af82a53250f29204a3fb138feaf520a878d0e..68c94fe29cd1b26925fa38a5c87= 7d699bbc88e25 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -338,6 +338,15 @@ static int riscv_ext_supm_validate(const struct riscv_= isa_ext_data *data, return -EPROBE_DEFER; } =20 +static int riscv_ext_zalrsc_depends(const struct riscv_isa_ext_data *data, + const unsigned long *isa_bitmap) +{ + if (__riscv_isa_extension_available(isa_bitmap, RISCV_ISA_EXT_ZALRSC)) + return 0; + + return -EPROBE_DEFER; +} + static const unsigned int riscv_a_exts[] =3D { RISCV_ISA_EXT_ZAAMO, RISCV_ISA_EXT_ZALRSC, @@ -543,7 +552,7 @@ const struct riscv_isa_ext_data riscv_isa_ext[] =3D { __RISCV_ISA_EXT_SUPERSET_VALIDATE(zicbom, RISCV_ISA_EXT_ZICBOM, riscv_xli= nuxenvcfg_exts, riscv_ext_zicbom_validate), __RISCV_ISA_EXT_DATA_VALIDATE(zicbop, RISCV_ISA_EXT_ZICBOP, riscv_ext_zic= bop_validate), __RISCV_ISA_EXT_SUPERSET_VALIDATE(zicboz, RISCV_ISA_EXT_ZICBOZ, riscv_xli= nuxenvcfg_exts, riscv_ext_zicboz_validate), - __RISCV_ISA_EXT_DATA(ziccrse, RISCV_ISA_EXT_ZICCRSE), + __RISCV_ISA_EXT_DATA_VALIDATE(ziccrse, RISCV_ISA_EXT_ZICCRSE, riscv_ext_z= alrsc_depends), __RISCV_ISA_EXT_SUPERSET_VALIDATE(zicfilp, RISCV_ISA_EXT_ZICFILP, riscv_x= linuxenvcfg_exts, riscv_cfilp_validate), __RISCV_ISA_EXT_SUPERSET_VALIDATE(zicfiss, RISCV_ISA_EXT_ZICFISS, riscv_x= linuxenvcfg_exts, --=20 2.43.0