linux-kernel - FAILED: Patch "riscv: vdso: Prevent the compiler from inserting calls to memset()" failed to apply to v4.19-stable tree

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Message-ID: <20241106021412.184114-1-sashal@kernel.org>
Date: Tue,  5 Nov 2024 21:14:12 -0500
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	alexghiti@...osinc.com
Cc: Guo Ren <guoren@...nel.org>,
	Palmer Dabbelt <palmer@...osinc.com>,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "riscv: vdso: Prevent the compiler from inserting calls to memset()" failed to apply to v4.19-stable tree

The patch below does not apply to the v4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

>From bf40167d54d55d4b54d0103713d86a8638fb9290 Mon Sep 17 00:00:00 2001
From: Alexandre Ghiti <alexghiti@...osinc.com>
Date: Wed, 16 Oct 2024 10:36:24 +0200
Subject: [PATCH] riscv: vdso: Prevent the compiler from inserting calls to
 memset()

The compiler is smart enough to insert a call to memset() in
riscv_vdso_get_cpus(), which generates a dynamic relocation.

So prevent this by using -fno-builtin option.

Fixes: e2c0cdfba7f6 ("RISC-V: User-facing API")
Cc: stable@...r.kernel.org
Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
Reviewed-by: Guo Ren <guoren@...nel.org>
Link: https://lore.kernel.org/r/20241016083625.136311-2-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
---
 arch/riscv/kernel/vdso/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
index 960feb1526caa..3f1c4b2d0b064 100644
--- a/arch/riscv/kernel/vdso/Makefile
+++ b/arch/riscv/kernel/vdso/Makefile
@@ -18,6 +18,7 @@ obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o
 
 ccflags-y := -fno-stack-protector
 ccflags-y += -DDISABLE_BRANCH_PROFILING
+ccflags-y += -fno-builtin
 
 ifneq ($(c-gettimeofday-y),)
   CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)
-- 
2.43.0