summaryrefslogtreecommitdiff
path: root/arch/parisc
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2023-07-22 10:46:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2023-07-22 10:46:30 -0700
commitbdd1d82e7d02bd2764a68a5cc54533dfc2ba452a (patch)
tree2fb501fab4fe4c34032b0f5a231d2c965303b85e /arch/parisc
parent725d444db6b0a8ed98461583ed1e6f12b8a7f0e9 (diff)
parent07e981137f17e5275b6fa5fd0c28b0ddb4519702 (diff)
Merge tag 'io_uring-6.5-2023-07-21' of git://git.kernel.dk/linux
Pull io_uring fixes from Jens Axboe: - Fix for io-wq not always honoring REQ_F_NOWAIT, if it was set and punted directly (eg via DRAIN) (me) - Capability check fix (Ondrej) - Regression fix for the mmap changes that went into 6.4, which apparently broke IA64 (Helge) * tag 'io_uring-6.5-2023-07-21' of git://git.kernel.dk/linux: ia64: mmap: Consider pgoff when searching for free mapping io_uring: Fix io_uring mmap() by using architecture-provided get_unmapped_area() io_uring: treat -EAGAIN for REQ_F_NOWAIT as final for io-wq io_uring: don't audit the capability check in io_uring_create()
Diffstat (limited to 'arch/parisc')
-rw-r--r--arch/parisc/kernel/sys_parisc.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index 9915062d5243..ca2d537e25b1 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -27,12 +27,17 @@
#include <linux/elf-randomize.h>
/*
- * Construct an artificial page offset for the mapping based on the physical
+ * Construct an artificial page offset for the mapping based on the virtual
* address of the kernel file mapping variable.
+ * If filp is zero the calculated pgoff value aliases the memory of the given
+ * address. This is useful for io_uring where the mapping shall alias a kernel
+ * address and a userspace adress where both the kernel and the userspace
+ * access the same memory region.
*/
-#define GET_FILP_PGOFF(filp) \
- (filp ? (((unsigned long) filp->f_mapping) >> 8) \
- & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL)
+#define GET_FILP_PGOFF(filp, addr) \
+ ((filp ? (((unsigned long) filp->f_mapping) >> 8) \
+ & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL) \
+ + (addr >> PAGE_SHIFT))
static unsigned long shared_align_offset(unsigned long filp_pgoff,
unsigned long pgoff)
@@ -112,7 +117,7 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
do_color_align = 0;
if (filp || (flags & MAP_SHARED))
do_color_align = 1;
- filp_pgoff = GET_FILP_PGOFF(filp);
+ filp_pgoff = GET_FILP_PGOFF(filp, addr);
if (flags & MAP_FIXED) {
/* Even MAP_FIXED mappings must reside within TASK_SIZE */