From: Borislav Petkov <bp@alien8.de>
To: Tony Luck <tony.luck@intel.com>
Cc: X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH v0 01/12] x86/mce: Do not use memset to clear the banks bitmaps
Date: Thu, 4 Nov 2021 15:40:24 +0100 [thread overview]
Message-ID: <20211104144035.20107-2-bp@alien8.de> (raw)
In-Reply-To: <20211104144035.20107-1-bp@alien8.de>
From: Borislav Petkov <bp@suse.de>
The bitmap is a single unsigned long so no need for the function call.
No functional changes.
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/kernel/cpu/mce/core.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 6ed365337a3b..52d277c955f9 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -1340,8 +1340,8 @@ static noinstr void unexpected_machine_check(struct pt_regs *regs)
noinstr void do_machine_check(struct pt_regs *regs)
{
int worst = 0, order, no_way_out, kill_current_task, lmce;
- DECLARE_BITMAP(valid_banks, MAX_NR_BANKS);
- DECLARE_BITMAP(toclear, MAX_NR_BANKS);
+ DECLARE_BITMAP(valid_banks, MAX_NR_BANKS) = { 0 };
+ DECLARE_BITMAP(toclear, MAX_NR_BANKS) = { 0 };
struct mca_config *cfg = &mca_cfg;
struct mce m, *final;
char *msg = NULL;
@@ -1385,7 +1385,6 @@ noinstr void do_machine_check(struct pt_regs *regs)
final = this_cpu_ptr(&mces_seen);
*final = m;
- memset(valid_banks, 0, sizeof(valid_banks));
no_way_out = mce_no_way_out(&m, &msg, valid_banks, regs);
barrier();
--
2.29.2
next prev parent reply other threads:[~2021-11-04 14:40 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-04 14:40 [PATCH v0 00/12] x86/mce: Correct the noinstr annotation Borislav Petkov
2021-11-04 14:40 ` Borislav Petkov [this message]
2021-11-04 14:40 ` [PATCH v0 02/12] x86/mce: Remove function-local cpus variables Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 03/12] x86/mce: Use mce_rdmsrl() in severity checking code Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 04/12] x86/mce: Remove noinstr annotation from mce_setup() Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 05/12] x86/mce: Allow instrumentation during task work queueing Borislav Petkov
2021-11-09 22:05 ` Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 06/12] x86/mce: Prevent severity computation from being instrumented Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 07/12] x86/mce: Mark mce_panic() noinstr Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 08/12] x86/mce: Mark mce_end() noinstr Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 09/12] x86/mce: Mark mce_read_aux() noinstr Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 10/12] x86/mce: Move the tainting outside of the noinstr region Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 11/12] x86/mce: Mark mce_timed_out() noinstr Borislav Petkov
2021-11-04 14:40 ` [PATCH v0 12/12] x86/mce: Mark mce_start() noinstr Borislav Petkov
2021-11-09 22:08 ` [PATCH v0 00/12] x86/mce: Correct the noinstr annotation Peter Zijlstra
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