linux-kernel - [tip: ras/core] x86/mce: Do not use memset to clear the banks bitmaps

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Date:   Mon, 13 Dec 2021 17:35:09 -0000
From:   "tip-bot2 for Borislav Petkov" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Borislav Petkov <bp@...e.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: ras/core] x86/mce: Do not use memset to clear the banks bitmaps

The following commit has been merged into the ras/core branch of tip:

Commit-ID:     cd5e0d1fc93a2218fbfb2b614f06e04e218ca948
Gitweb:        https://git.kernel.org/tip/cd5e0d1fc93a2218fbfb2b614f06e04e218ca948
Author:        Borislav Petkov <bp@...e.de>
AuthorDate:    Mon, 01 Nov 2021 15:34:48 +01:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Mon, 13 Dec 2021 14:11:22 +01:00

x86/mce: Do not use memset to clear the banks bitmaps

The bitmap is a single unsigned long so no need for the function call.

No functional changes.

Signed-off-by: Borislav Petkov <bp@...e.de>
Link: https://lore.kernel.org/r/20211208111343.8130-2-bp@alien8.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 30de00f..7c264ee 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -1336,8 +1336,8 @@ 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;
@@ -1381,7 +1381,6 @@ 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();