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Message-Id: <20241029-v5_user_cfi_series-v7-5-2727ce9936cb@rivosinc.com>
Date: Tue, 29 Oct 2024 16:44:05 -0700
From: Deepak Gupta <debug@...osinc.com>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"Liam R. Howlett" <Liam.Howlett@...cle.com>,
Vlastimil Babka <vbabka@...e.cz>,
Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
Conor Dooley <conor@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>, Arnd Bergmann <arnd@...db.de>,
Christian Brauner <brauner@...nel.org>,
Peter Zijlstra <peterz@...radead.org>, Oleg Nesterov <oleg@...hat.com>,
Eric Biederman <ebiederm@...ssion.com>, Kees Cook <kees@...nel.org>,
Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
devicetree@...r.kernel.org, linux-arch@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
alistair.francis@....com, richard.henderson@...aro.org, jim.shu@...ive.com,
andybnac@...il.com, kito.cheng@...ive.com, charlie@...osinc.com,
atishp@...osinc.com, evan@...osinc.com, cleger@...osinc.com,
alexghiti@...osinc.com, samitolvanen@...gle.com, broonie@...nel.org,
rick.p.edgecombe@...el.com, Samuel Holland <samuel.holland@...ive.com>,
Andrew Jones <ajones@...tanamicro.com>,
Conor Dooley <conor.dooley@...rochip.com>,
Deepak Gupta <debug@...osinc.com>
Subject: [PATCH v7 05/32] riscv: Call riscv_user_isa_enable() only on the
boot hart
From: Samuel Holland <samuel.holland@...ive.com>
Now that the [ms]envcfg CSR value is maintained per thread, not per
hart, riscv_user_isa_enable() only needs to be called once during boot,
to set the value for the init task. This also allows it to be marked as
__init.
Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
Reviewed-by: Deepak Gupta <debug@...osinc.com>
Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
---
arch/riscv/include/asm/cpufeature.h | 2 +-
arch/riscv/kernel/cpufeature.c | 4 ++--
arch/riscv/kernel/smpboot.c | 2 --
3 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/arch/riscv/include/asm/cpufeature.h b/arch/riscv/include/asm/cpufeature.h
index 45f9c1171a48..ce9a995730c1 100644
--- a/arch/riscv/include/asm/cpufeature.h
+++ b/arch/riscv/include/asm/cpufeature.h
@@ -31,7 +31,7 @@ DECLARE_PER_CPU(struct riscv_cpuinfo, riscv_cpuinfo);
/* Per-cpu ISA extensions. */
extern struct riscv_isainfo hart_isa[NR_CPUS];
-void riscv_user_isa_enable(void);
+void __init riscv_user_isa_enable(void);
#define _RISCV_ISA_EXT_DATA(_name, _id, _subset_exts, _subset_exts_size, _validate) { \
.name = #_name, \
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 27bafc5dd62d..b3a057c36996 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -920,12 +920,12 @@ unsigned long riscv_get_elf_hwcap(void)
return hwcap;
}
-void riscv_user_isa_enable(void)
+void __init riscv_user_isa_enable(void)
{
if (riscv_has_extension_unlikely(RISCV_ISA_EXT_ZICBOZ))
current->thread.envcfg |= ENVCFG_CBZE;
else if (any_cpu_has_zicboz)
- pr_warn_once("Zicboz disabled as it is unavailable on some harts\n");
+ pr_warn("Zicboz disabled as it is unavailable on some harts\n");
}
#ifdef CONFIG_RISCV_ALTERNATIVE
diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 0f8f1c95ac38..e36d20205bd7 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -233,8 +233,6 @@ asmlinkage __visible void smp_callin(void)
numa_add_cpu(curr_cpuid);
set_cpu_online(curr_cpuid, true);
- riscv_user_isa_enable();
-
/*
* Remote cache and TLB flushes are ignored while the CPU is offline,
* so flush them both right now just in case.
--
2.34.1
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