[lkml]   [2018]   [May]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCHv2 1/2] x86/boot/compressed/64: Set up GOT for paging_prepare() and cleanup_trampoline()
On Wed, 16 May 2018, Kirill A. Shutemov wrote:

> Eric and Hugh have reported instant reboot due to my recent changes in
> decompression code.
> The root cause is that I didn't realize that we need to adjust GOT to be
> able to run C code that early.
> The problem is only visible with an older toolchain. Binutils >= 2.24 is
> able to eliminate GOT references by replacing them with RIP-relative
> address loads[1].
> We need to adjust GOT two times:
> - before calling paging_prepare() using the initial load address
> - before calling C code from the relocated kernel
> [1];a=commitdiff;h=80d873266dec
> Signed-off-by: Kirill A. Shutemov <>
> Fixes: 194a9749c73d ("x86/boot/compressed/64: Handle 5-level paging boot if kernel is above 4G")
> Reported-by: Eric Dumazet <>
> Reported-by: Hugh Dickins <>

Very nice and well done!

Reviewed-by: Thomas Gleixner <>

 \ /
  Last update: 2018-05-16 11:53    [W:0.042 / U:0.964 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site