mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-02 07:04:24 +00:00
Code Issues Releases Wiki Activity

Bug-fixes:

Browse source 
- fix a preemption bug in xen/balloon.c;
 - remove an harmful BUG_ON in xen/balloon.c that can trigger in
 non-erroneous situations.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.10 (GNU/Linux)
 
 iQIcBAABAgAGBQJSMbVUAAoJEIlPj0hw4a6QgXsQALHtpUhYBeGqfjgeq6jK9TW0
 QHDubH8kT2JIoKEzSgTHIKTWtGgkggc4571CKMMuGRBQIZSqc29zAFsqvVbv4Hrs
 5sckGFZ/c7Fh8tYeHie9OsdJd3qTN0Gz15yOL8/n/aSPkkIi9FLRkOOEOukLuF7F
 iCCxRol+ZNr7okgS3HC2KPG8/UKprM2dlbxYDoK3ixJ6aYoJIQDH/VSZIHnhmjqe
 wsPcxwiHnVMC47iegFWwCdz70+A3IYB0d4+m9puIruMVXwW/T/1IPQphEqXZevaL
 0uOnwN69T2DaCWusBxF0Bw66TLpeAVZkyt+3negjghZbWsFZ2gA5e0bWugkD2j6r
 e1Teo1gG32xdDyUChDDI0Ef02BtgdoBtR6ldRt1gGrZCu+L5CqjbmMjebHI8FPTx
 0RDC5YdfadPyPNZrc7H1TlGuOAdJpO4MgeT2A5ha/i0x56qnR5pD/atpWC+IZqr5
 LVdtNTZPa6TlaIo6g2vmpYAnYhvY94UQdBz26zqazc0ILJJwfr9SdBO7W0EwPL8I
 PlMoIt+UV/aV3baKnDeG0kVQvJdvEOTlsLcTxjl7kKTTLaKqyaQ9oOoGDijWeOtG
 zir2em6QLuy+lP4ZnMZVgrMAcLTmqVO+RX5amNIHGeHEaMoRZu18nRgVnsjFGLLu
 JcwE+k4pDhcQkCKnhLNL
 =kWtE
 -----END PGP SIGNATURE-----

Merge tag 'stable/for-linus-3.12-rc0-tag-three' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen balloon driver bug-fixes from Stefano Stabellini:
 - fix a preemption bug in xen/balloon.c;
 - remove an harmful BUG_ON in xen/balloon.c that can trigger in
   non-erroneous situations.

* tag 'stable/for-linus-3.12-rc0-tag-three' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/balloon: remove BUG_ON in increase_reservation
  xen/balloon: ensure preemption is disabled when using a scratch page
This commit is contained in:
Linus Torvalds 2013-09-12 11:28:24 -07:00
commit d5adf7e2db
1 changed files with 7 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
drivers/xen/balloon.c
View file

@ -349,8 +349,6 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
BUG_ON(page == NULL);
pfn = page_to_pfn(page);
BUG_ON(!xen_feature(XENFEAT_auto_translated_physmap) &&
phys_to_machine_mapping_valid(pfn));
set_phys_to_machine(pfn, frame_list[i]);
@ -380,6 +378,7 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
enum bp_state state = BP_DONE;
unsigned long pfn, i;
struct page *page;
struct page *scratch_page;
int ret;
struct xen_memory_reservation reservation = {
.address_bits = 0,
@ -399,6 +398,8 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
if (nr_pages > ARRAY_SIZE(frame_list))
nr_pages = ARRAY_SIZE(frame_list);
scratch_page = get_balloon_scratch_page();
for (i = 0; i < nr_pages; i++) {
page = alloc_page(gfp);
if (page == NULL) {
@ -416,7 +417,7 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
if (xen_pv_domain() && !PageHighMem(page)) {
ret = HYPERVISOR_update_va_mapping(
(unsigned long)__va(pfn << PAGE_SHIFT),
pfn_pte(page_to_pfn(__get_cpu_var(balloon_scratch_page)),
pfn_pte(page_to_pfn(scratch_page),
PAGE_KERNEL_RO), 0);
BUG_ON(ret);
}
@ -432,14 +433,14 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
pfn = mfn_to_pfn(frame_list[i]);
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
unsigned long p;
struct page *pg;
pg = __get_cpu_var(balloon_scratch_page);
p = page_to_pfn(pg);
p = page_to_pfn(scratch_page);
__set_phys_to_machine(pfn, pfn_to_mfn(p));
}
balloon_append(pfn_to_page(pfn));
}
put_balloon_scratch_page();
set_xen_guest_handle(reservation.extent_start, frame_list);
reservation.nr_extents = nr_pages;
ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);