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IDE: Save a call to PageHighMem()
PageHighMem() isn't cheap so avoid calling it twice on the same page. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 4 additions and 2 deletions
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@ -236,6 +236,7 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
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while (len) {
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unsigned nr_bytes = min(len, cursg->length - cmd->cursg_ofs);
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int page_is_high;
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if (nr_bytes > PAGE_SIZE)
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nr_bytes = PAGE_SIZE;
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@ -247,7 +248,8 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
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page = nth_page(page, (offset >> PAGE_SHIFT));
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offset %= PAGE_SIZE;
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if (PageHighMem(page))
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page_is_high = PageHighMem(page);
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if (page_is_high)
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local_irq_save(flags);
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buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
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@ -268,7 +270,7 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
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kunmap_atomic(buf, KM_BIO_SRC_IRQ);
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if (PageHighMem(page))
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if (page_is_high)
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local_irq_restore(flags);
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len -= nr_bytes;
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