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Message-Id: <1453486392-10289-1-git-send-email-kuleshovmail@gmail.com> Date: Sat, 23 Jan 2016 00:13:12 +0600 From: Alexander Kuleshov <kuleshovmail@...il.com> To: Thomas Gleixner <tglx@...utronix.de> Cc: Ingo Molnar <mingo@...hat.com>, "H . Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...e.de>, Denys Vlasenko <dvlasenk@...hat.com>, Andrey Ryabinin <ryabinin.a.a@...il.com>, x86@...nel.org, linux-kernel@...r.kernel.org, Alexander Kuleshov <kuleshovmail@...il.com> Subject: [RFC PATCH] x86/head_64.S: remove redundant check that kernel address is 2M aligned We check that the base address of the kernel is 2M aligned in the arch/x86/kernel/head_65.S right after jump to the decompressed kernel. But we already have a check in the decompress_kernel() which validates that kernel location is MIN_KERNEL_ALIGN aligned which is 2M too for x86_64. Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com> --- arch/x86/kernel/head_64.S | 6 ------ 1 file changed, 6 deletions(-) diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index ffdc0e8..4967cba 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -75,12 +75,6 @@ startup_64: leaq _text(%rip), %rbp subq $_text - __START_KERNEL_map, %rbp - /* Is the address not 2M aligned? */ - movq %rbp, %rax - andl $~PMD_PAGE_MASK, %eax - testl %eax, %eax - jnz bad_address - /* * Is the address too large? */ -- 2.7.0.25.gfc10eb5
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