Helge Deller 70be49f2f6 parisc: Fix userspace graphics card breakage due to pgtable special bit ... Commit df24e1783e ("parisc: Add vDSO support") introduced the vDSO support, for which a _PAGE_SPECIAL page table flag was needed. Since we wanted to keep every page table entry in 32-bits, this patch re-used the existing - but yet unused - _PAGE_DMB flag (which triggers a hardware break if a page is accessed) to store the special bit. But when graphics card memory is mmapped into userspace, the kernel uses vm_iomap_memory() which sets the the special flag. So, with the DMB bit set, every access to the graphics memory now triggered a hardware exception and segfaulted the userspace program. Fix this breakage by dropping the DMB bit when writing the page protection bits to the CPU TLB. In addition this patch adds a small optimization: if huge pages aren't configured (which is at least the case for 32-bit kernels), then the special bit is stored in the hpage (HUGE PAGE) bit instead. That way we can skip to reset the DMB bit. Fixes: df24e1783e ("parisc: Add vDSO support") Cc: <stable@vger.kernel.org> # 5.18+ Signed-off-by: Helge Deller <deller@gmx.de>		2022-10-14 10:45:12 +02:00
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alpha	provide arch_test_bit_acquire for architectures that define test_bit	2022-08-27 09:49:54 -07:00
arc	Kbuild updates for v5.20	2022-08-10 10:40:41 -07:00
arm	ARM: SoC fixes for 6.0-rc7	2022-09-27 16:49:42 -07:00
arm64	ARM: SoC fixes for 6.0-rc7	2022-09-27 16:49:42 -07:00
csky	Merge 'irq/loongarch', 'pci/ctrl/loongson' and 'pci/header-cleanup-immutable'	2022-08-11 21:06:14 +08:00
hexagon	provide arch_test_bit_acquire for architectures that define test_bit	2022-08-27 09:49:54 -07:00
ia64	provide arch_test_bit_acquire for architectures that define test_bit	2022-08-27 09:49:54 -07:00
loongarch	LoongArch: Clean up loongson3_smp_ops declaration	2022-09-29 10:15:00 +08:00
m68k	provide arch_test_bit_acquire for architectures that define test_bit	2022-08-27 09:49:54 -07:00
microblaze	- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe	2022-08-05 16:32:45 -07:00
mips	MIPS: Loongson32: Fix PHY-mode being left unspecified	2022-09-19 16:31:32 +02:00
nios2	nios2: add force_successful_syscall_return()	2022-08-15 11:25:32 -05:00
openrisc	Updates to various subsystems which I help look after. lib, ocfs2,	2022-08-07 10:03:24 -07:00
parisc	parisc: Fix userspace graphics card breakage due to pgtable special bit	2022-10-14 10:45:12 +02:00
powerpc	26 hotfixes. 8 are for issues which were introduced during this -rc	2022-09-26 13:23:15 -07:00
riscv	RISC-V Fixes for 6.0-rc7	2022-09-23 08:51:05 -07:00
s390	KVM: s390: pci: register pci hooks without interpretation	2022-09-21 16:18:38 +02:00
sh	asm-generic: Conditionally enable do_softirq_own_stack() via Kconfig.	2022-09-05 17:20:55 +02:00
sparc	asm-generic: Conditionally enable do_softirq_own_stack() via Kconfig.	2022-09-05 17:20:55 +02:00
um	arch: um: Mark the stack non-executable to fix a binutils warning	2022-09-21 09:11:42 +02:00
x86	Misc fixes:	2022-10-02 09:41:27 -07:00
xtensa	Merge 'irq/loongarch', 'pci/ctrl/loongson' and 'pci/header-cleanup-immutable'	2022-08-11 21:06:14 +08:00
.gitignore
Kconfig	asm-generic: Conditionally enable do_softirq_own_stack() via Kconfig.	2022-09-05 17:20:55 +02:00