Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-24 13:11:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

powerpc fixes for 5.1 #7

Browse Source 
One regression fix.
 
 Changes we merged to STRICT_KERNEL_RWX on 32-bit were causing crashes under
 load on some machines depending on memory layout.
 
 Thanks to:
   Christophe Leroy.
 -----BEGIN PGP SIGNATURE-----
 
 iQIcBAABAgAGBQJczY3sAAoJEFHr6jzI4aWA9UkP/3iM1wt/L3iYpmfPA0MJ4h4f
 oEB2WR4KFhBHcMbLKUNS0m9MfecAxHyrFXW46lnFbqVLbaJ3rBSRBitTySo1VnT3
 wJKJi/rEf1uNmjxFTKRuE4eL1+4H2OVbwF+CLRB4jaILBmgDyvgYQDkeYQE689ut
 VjLA1C/8PRlKFO/82nGPaASdugqk4o+swxNxODhG+Bjv+9KGSinK4LN6zqyLoU/f
 aS4APLO59xd6vXosDZRiK6C5efoMu+8kAm8/pyA9E8+0TFTdrtZcPrbCme9Vj9xh
 i1Ruzxf9njZaSG37TQpgaFA/IKlSjBqAdaRmA6dy7fQ+GAOpt7YhtNIhk9prvOT6
 uGarcHuusQ/Nhy0pb+Kt5H90RKzcZr/pgDEjhujJdCnVozQnX4fvkOjm8SvV6vc4
 ucy2zzraMRo3OTvs38YAyGj/MPxOvMYZ1G+v/rAxpfvmdDl6KQ3uCvSczujP7qo6
 49VfvfENGRTQhb+KSQtD4VtR9rFvMco5F8m1TFlYI1+RcoxHqqcR8aTK22wQvs45
 2J97mkOvVeIp2pO7+yB5c2t3rPG9Qg9ARifnxXyF+9Cb1h1USy3vF2zUCj+wZSeP
 l+cYYcjrk/C6btDTVARMOXLKyeB4CWHaSCz8s3HIrXkuZsJbA3/qGi25mCWAEOVj
 1qN6UpFNICtXOHBCAPYx
 =/m4Q
 -----END PGP SIGNATURE-----

Merge tag 'powerpc-5.1-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fix from Michael Ellerman:
 "One regression fix.

  Changes we merged to STRICT_KERNEL_RWX on 32-bit were causing crashes
  under load on some machines depending on memory layout.

  Thanks to Christophe Leroy"

* tag 'powerpc-5.1-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/32s: Fix BATs setting with CONFIG_STRICT_KERNEL_RWX
This commit is contained in:
Linus Torvalds 2019-05-04 12:24:05 -07:00
commit 6203838dec
1 changed files with 14 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
arch/powerpc/mm/ppc_mmu_32.c
View File

@ -98,10 +98,20 @@ static int find_free_bat(void)
return -1;
}
/*
* This function calculates the size of the larger block usable to map the
* beginning of an area based on the start address and size of that area:
* - max block size is 8M on 601 and 256 on other 6xx.
* - base address must be aligned to the block size. So the maximum block size
* is identified by the lowest bit set to 1 in the base address (for instance
* if base is 0x16000000, max size is 0x02000000).
* - block size has to be a power of two. This is calculated by finding the
* highest bit set to 1.
*/
static unsigned int block_size(unsigned long base, unsigned long top)
{
unsigned int max_size = (cpu_has_feature(CPU_FTR_601) ? 8 : 256) << 20;
unsigned int base_shift = (fls(base) - 1) & 31;
unsigned int base_shift = (ffs(base) - 1) & 31;
unsigned int block_shift = (fls(top - base) - 1) & 31;
return min3(max_size, 1U << base_shift, 1U << block_shift);
@ -157,7 +167,7 @@ static unsigned long __init __mmu_mapin_ram(unsigned long base, unsigned long to
unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
{
int done;
unsigned long done;
unsigned long border = (unsigned long)__init_begin - PAGE_OFFSET;
if (__map_without_bats) {
@ -169,10 +179,10 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
return __mmu_mapin_ram(base, top);
done = __mmu_mapin_ram(base, border);
if (done != border - base)
if (done != border)
return done;
return done + __mmu_mapin_ram(border, top);
return __mmu_mapin_ram(border, top);
}
void mmu_mark_initmem_nx(void)