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| author | Jakub Kicinski <kuba@kernel.org> | 2023-07-27 15:21:46 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-07-27 15:22:46 -0700 |
| commit | 014acf26685cfcfae37c9e98b83c622c0b01cf19 (patch) | |
| tree | 85ce0217698aef25875fdc62f2332bbbbc1bff2c /arch/parisc/kernel/sys_parisc.c | |
| parent | 9d0cd5d25f7d45bce01bbb3193b54ac24b3a60f3 (diff) | |
| parent | 57012c57536f8814dec92e74197ee96c3498d24e (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Cross-merge networking fixes after downstream PR.
No conflicts or adjacent changes.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'arch/parisc/kernel/sys_parisc.c')
| -rw-r--r-- | arch/parisc/kernel/sys_parisc.c | 15 |
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 */ |