linux-kernel - [PATCH] x86: fix .bss with -fdata-sections

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Message-Id: <20190415164956.124067-1-samitolvanen@google.com>
Date:   Mon, 15 Apr 2019 09:49:56 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Nicholas Piggin <npiggin@...il.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH] x86: fix .bss with -fdata-sections

With LD_DEAD_CODE_DATA_ELIMINATION, we compile the kernel with
-fdata-sections, which also splits the .bss section. Use the
common BSS_MAIN macro in the linker script to properly merge all
the generated sections.

Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
 arch/x86/kernel/vmlinux.lds.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index bad8c51fee6e..a5127b2c195f 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -362,7 +362,7 @@ SECTIONS
 	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
 		__bss_start = .;
 		*(.bss..page_aligned)
-		*(.bss)
+		*(BSS_MAIN)
 		BSS_DECRYPTED
 		. = ALIGN(PAGE_SIZE);
 		__bss_stop = .;
-- 
2.21.0.392.gf8f6787159e-goog