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Commit a9079052 authored by Jean Delvare's avatar Jean Delvare Committed by David S. Miller
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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: default avatarJean Delvare <khali@linux-fr.org>
Acked-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 90bc1a65

drivers/ide/ide-taskfile.c

+4 −2
Original line number Diff line number Diff line
@@ -236,6 +236,7 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd, 


	while (len) {

		unsigned nr_bytes = min(len, cursg->length - cmd->cursg_ofs);

		int page_is_high;



		if (nr_bytes > PAGE_SIZE)

			nr_bytes = PAGE_SIZE;
@@ -247,7 +248,8 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd, 
		page = nth_page(page, (offset >> PAGE_SHIFT));

		offset %= PAGE_SIZE;



		if (PageHighMem(page))

		page_is_high = PageHighMem(page);

		if (page_is_high)

			local_irq_save(flags);



		buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
@@ -268,7 +270,7 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd, 


		kunmap_atomic(buf, KM_BIO_SRC_IRQ);



		if (PageHighMem(page))

		if (page_is_high)

			local_irq_restore(flags);



		len -= nr_bytes;