kernel/git/stable/linux-stable.git/drivers/char/mem.c, branch linux-2.6.22.y

Make /dev/port conditional on config symbol

2007-05-08T18:15:07+00:00

Instead of having /dev/port support dependent in multiple places on a string of preprocessor symbols, define a new configuration directive for it. This ensures that all four places remain consistent with each other. Signed-off-by: Russell King Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

header cleaning: don't include smp_lock.h when not used

2007-05-08T18:15:07+00:00

Remove includes of where it is not used/needed. Suggested by Al Viro. Builds cleanly on x86_64, i386, alpha, ia64, powerpc, sparc, sparc64, and arm (all 59 defconfigs). Signed-off-by: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

fix bogon in /dev/mem mmap'ing on nommu

2007-04-17T23:36:27+00:00

While digging through my MAP_FIXED changes, I found that rather obvious bug in /dev/mem mmap implementation for nommu archs. get_unmapped_area() is expected to return an address, not a pfn. Signed-off-by: Benjamin Herrenschmidt Acked-By: David Howells Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Revert "[PATCH] Fix up mmap_kmem"

2007-01-22T16:53:24+00:00

This reverts commit 99a10a60ba9bedcf5d70ef81414d3e03816afa3f. As per Hugh Dickins: "Nadia Derbey has reported that mmap of /dev/kmem no longer works with the kernel virtual address as offset, and Franck has confirmed that his patch came from a misunderstanding of what an offset means to /dev/kmem - whereas his patch description seems to say that he was correcting the offset on a few plaforms, there was no such problem to correct, and his patch was in fact changing its API on all platforms." Suggested-by: Hugh Dickins Cc: Franck Bui-Huu Cc: Nadia Derbey Cc: Andi Kleen Cc: Arjan van de Ven Cc: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] read_zero_pagealigned() locking fix

2006-12-10T17:55:39+00:00

Ramiro Voicu hits the BUG_ON(!pte_none(*pte)) in zeromap_pte_range: kernel bugzilla 7645. Right: read_zero_pagealigned uses down_read of mmap_sem, but another thread's racing read of /dev/zero, or a normal fault, can easily set that pte again, in between zap_page_range and zeromap_page_range getting there. It's been wrong ever since 2.4.3. The simple fix is to use down_write instead, but that would serialize reads of /dev/zero more than at present: perhaps some app would be badly affected. So instead let zeromap_page_range return the error instead of BUG_ON, and read_zero_pagealigned break to the slower clear_user loop in that case - there's no need to optimize for it. Use -EEXIST for when a pte is found: BUG_ON in mmap_zero (the other user of zeromap_page_range), though it really isn't interesting there. And since mmap_zero wants -EAGAIN for out-of-memory, the zeromaps better return that than -ENOMEM. Signed-off-by: Hugh Dickins Cc: Ramiro Voicu: Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] struct path: convert char-drivers

2006-12-08T16:28:44+00:00

Signed-off-by: Josef Sipek Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Driver core: change mem class_devices to be real devices

2006-12-01T22:52:00+00:00

Signed-off-by: Greg Kroah-Hartman

Include proper header file for PFN_DOWN()

2006-10-13T15:42:10+00:00

The recent commit (99a10a60ba9bedcf5d70ef81414d3e03816afa3f) to fix up mmap_kmem() broke compiles because it used PFN_DOWN() without including . Signed-off-by: Linus Torvalds

[PATCH] Fix up mmap_kmem

2006-10-13T15:35:38+00:00

vma->vm_pgoff is an pfn _offset_ relatif to the begining of the memory start. The previous code was doing at first: vma->vm_pgoff << PAGE_SHIFT which results into a wrong physical address since some platforms have a physical mem start that can be different from 0. After that the previous call __pa() on this wrong physical address, however __pa() is used to convert a _virtual_ address into a physical one. This patch rewrites this convertion. It calculates the pfn of PAGE_OFFSET which is the pfn of the mem start then it adds the vma->vm_pgoff to it. It also uses virt_to_phys() instead of __pa() since the latter shouldn't be used by drivers. Signed-off-by: Franck Bui-Huu Signed-off-by: Linus Torvalds

[PATCH] mem driver: fix conditional on isa i/o support

2006-09-29T16:18:22+00:00

This change corrects the logic on the preprocessor conditionals that include support for ISA port i/o (/dev/ioports) into the mem character driver. This fixes the following error when building for powerpc platforms with CONFIG_PCI=n. drivers/built-in.o: undefined reference to `pci_io_base' Signed-off-by: Geoff Levand Acked-by: Linas Vepstas Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds