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| author |   David Woodhouse <dwmw@amazon.co.uk> | 2018-02-01 11:27:20 +0000 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2018-02-02 12:28:27 +0100 |
| commit | 66f793099a636862a71c59d4a6ba91387b155e0c (patch) | |
| tree | 078d68cb71b0ac7b49f42740b0b542315ef7f1da /include/linux/init.h | |
| parent | x86/kvm: Update spectre-v1 mitigation (diff) | |
| download | linux-dev-66f793099a636862a71c59d4a6ba91387b155e0c.tar.xz linux-dev-66f793099a636862a71c59d4a6ba91387b155e0c.zip | |
x86/retpoline: Avoid retpolines for built-in __init functions
There's no point in building init code with retpolines, since it runs before
any potentially hostile userspace does. And before the retpoline is actually
ALTERNATIVEd into place, for much of it.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: karahmed@amazon.de
Cc: peterz@infradead.org
Cc: bp@alien8.de
Link: https://lkml.kernel.org/r/1517484441-1420-2-git-send-email-dwmw@amazon.co.uk
Diffstat (limited to 'include/linux/init.h')
| -rw-r--r-- | include/linux/init.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/init.h b/include/linux/init.h index ea1b31101d9e..506a98151131 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -5,6 +5,13 @@ #include <linux/compiler.h> #include <linux/types.h> +/* Built-in __init functions needn't be compiled with retpoline */ +#if defined(RETPOLINE) && !defined(MODULE) +#define __noretpoline __attribute__((indirect_branch("keep"))) +#else +#define __noretpoline +#endif + /* These macros are used to mark some functions or * initialized data (doesn't apply to uninitialized data) * as `initialization' functions. The kernel can take this @@ -40,7 +47,7 @@ /* These are for everybody (although not all archs will actually discard it in modules) */ -#define __init __section(.init.text) __cold __latent_entropy +#define __init __section(.init.text) __cold __latent_entropy __noretpoline #define __initdata __section(.init.data) #define __initconst __section(.init.rodata) #define __exitdata __section(.exit.data) |