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Commite3d0359

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hjl-toolsIngo Molnar
authored and
Ingo Molnar
committed
x86/build/64: Force the linker to use 2MB page size
Binutils 2.31 will enable -z separate-code by default for x86 to avoidmixing code pages with data to improve cache performance as well assecurity. To reduce x86-64 executable and shared object sizes, themaximum page size is reduced from 2MB to 4KB. But x86-64 kernel mustbe aligned to 2MB. Pass -z max-page-size=0x200000 to linker to force2MB page size regardless of the default page size used by linker.Tested with Linux kernel 4.15.6 on x86-64.Signed-off-by: H.J. Lu <hjl.tools@gmail.com>Cc: Andy Shevchenko <andy.shevchenko@gmail.com>Cc: Eric Biederman <ebiederm@xmission.com>Cc: H. Peter Anvin <hpa@zytor.com>Cc: Juergen Gross <jgross@suse.com>Cc: Kees Cook <keescook@chromium.org>Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>Cc: Linus Torvalds <torvalds@linux-foundation.org>Cc: Peter Zijlstra <peterz@infradead.org>Cc: Thomas Gleixner <tglx@linutronix.de>Link:http://lkml.kernel.org/r/CAMe9rOp4_%3D_8twdpTyAP2DhONOCeaTOsniJLoppzhoNptL8xzA@mail.gmail.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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‎arch/x86/Makefile‎

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@@ -223,6 +223,15 @@ KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
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LDFLAGS := -m elf_$(UTS_MACHINE)
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#
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# The 64-bit kernel must be aligned to 2MB. Pass -z max-page-size=0x200000 to
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# the linker to force 2MB page size regardless of the default page size used
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# by the linker.
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#
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ifdefCONFIG_X86_64
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LDFLAGS +=$(call ld-option, -z max-page-size=0x200000)
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endif
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# Speed up the build
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KBUILD_CFLAGS += -pipe
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# Workaround for a gcc prelease that unfortunately was shipped in a suse release

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