linux-kernel - [tip:efi/core] x86/efi: Replace GFP_ATOMIC with GFP_KERNEL in efi_query_variable

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Date:   Fri, 9 Mar 2018 01:13:19 -0800
From:   tip-bot for Jia-Ju Bai <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...nel.org,
        torvalds@...ux-foundation.org, ard.biesheuvel@...aro.org,
        peterz@...radead.org, baijiaju1990@...il.com, hpa@...or.com,
        matt@...eblueprint.co.uk
Subject: [tip:efi/core] x86/efi: Replace GFP_ATOMIC with GFP_KERNEL in
 efi_query_variable_store()

Commit-ID:  9f66d8d73e654c5f867daa6aa186300ecaf49d3a
Gitweb:     https://git.kernel.org/tip/9f66d8d73e654c5f867daa6aa186300ecaf49d3a
Author:     Jia-Ju Bai <baijiaju1990@...il.com>
AuthorDate: Thu, 8 Mar 2018 08:00:14 +0000
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 9 Mar 2018 08:58:22 +0100

x86/efi: Replace GFP_ATOMIC with GFP_KERNEL in efi_query_variable_store()

efi_query_variable_store() does an atomic kzalloc() unnecessarily,
because we can never get this far when called in an atomic context,
namely when nonblocking == 1.

Replace it with GFP_KERNEL.

This was found by the DCNS static analysis tool written by myself.

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-efi@...r.kernel.org
Link: http://lkml.kernel.org/r/20180308080020.22828-7-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/platform/efi/quirks.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
index 5b513ccffde4..1ef11c26f79b 100644
--- a/arch/x86/platform/efi/quirks.c
+++ b/arch/x86/platform/efi/quirks.c
@@ -177,7 +177,7 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size,
 		 * that by attempting to use more space than is available.
 		 */
 		unsigned long dummy_size = remaining_size + 1024;
-		void *dummy = kzalloc(dummy_size, GFP_ATOMIC);
+		void *dummy = kzalloc(dummy_size, GFP_KERNEL);
 
 		if (!dummy)
 			return EFI_OUT_OF_RESOURCES;