diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-15 15:56:12 -0500 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-15 15:56:12 -0500 |
commit | 647df5189fecb2c2fa811421a3f28bf9034e3a70 (patch) | |
tree | f3fac52eedac2bb74a760a798ea8c397e2878553 /Documentation | |
parent | cbbc49877d44408c4d0decf77c3c141732bbc679 (diff) | |
parent | 175add1981e53d22caba8f42d5f924a4de507b6c (diff) |
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
[IA64] SN specific version of dma_get_required_mask()
[IA64] generic_defconfig: Enable SATA_VITESSE
[IA64] dump stack on kernel unaligned warnings
[IA64] Turn on CONFIG_HAVE_UNSTABLE_CLOCK
[IA64] Update to use account_{steal,idle}_ticks
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/DMA-API.txt | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt index b462bb149543..52441694fe03 100644 --- a/Documentation/DMA-API.txt +++ b/Documentation/DMA-API.txt | |||
@@ -170,16 +170,15 @@ Returns: 0 if successful and a negative error if not. | |||
170 | u64 | 170 | u64 |
171 | dma_get_required_mask(struct device *dev) | 171 | dma_get_required_mask(struct device *dev) |
172 | 172 | ||
173 | After setting the mask with dma_set_mask(), this API returns the | 173 | This API returns the mask that the platform requires to |
174 | actual mask (within that already set) that the platform actually | 174 | operate efficiently. Usually this means the returned mask |
175 | requires to operate efficiently. Usually this means the returned mask | ||
176 | is the minimum required to cover all of memory. Examining the | 175 | is the minimum required to cover all of memory. Examining the |
177 | required mask gives drivers with variable descriptor sizes the | 176 | required mask gives drivers with variable descriptor sizes the |
178 | opportunity to use smaller descriptors as necessary. | 177 | opportunity to use smaller descriptors as necessary. |
179 | 178 | ||
180 | Requesting the required mask does not alter the current mask. If you | 179 | Requesting the required mask does not alter the current mask. If you |
181 | wish to take advantage of it, you should issue another dma_set_mask() | 180 | wish to take advantage of it, you should issue a dma_set_mask() |
182 | call to lower the mask again. | 181 | call to set the mask to the value returned. |
183 | 182 | ||
184 | 183 | ||
185 | Part Id - Streaming DMA mappings | 184 | Part Id - Streaming DMA mappings |