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27 March 2024, 02:37:15 UTC
Revision 203fc3177dd7427a1f87ec33de201c6d67b5c5cb authored by Linus Torvalds on 24 May 2023, 18:31:37 UTC, committed by Linus Torvalds on 24 May 2023, 18:31:37 UTC 
Merge tag 'mmc-v6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
 
Pull MMC fixes from Ulf Hansson:
 "MMC core:

   - Fix error propagation for the non-block-device I/O paths

  MMC host:

   - sdhci-cadence: Fix an error path during probe

   - sdhci-esdhc-imx: Fix support for the 'no-mmc-hs400' DT property"

* tag 'mmc-v6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
  mmc: sdhci-esdhc-imx: make "no-mmc-hs400" works
  mmc: sdhci-cadence: Fix an error handling path in sdhci_cdns_probe()
  mmc: block: ensure error propagation for non-blk
2 parent s 9d64600 + 81dce14
Raw File
Tip revision: 203fc3177dd7427a1f87ec33de201c6d67b5c5cb authored by Linus Torvalds on 24 May 2023, 18:31:37 UTC
Merge tag 'mmc-v6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
Tip revision: 203fc31
memweight.c 
// SPDX-License-Identifier: GPL-2.0
#include <linux/export.h>
#include <linux/bug.h>
#include <linux/bitmap.h>

/**
 * memweight - count the total number of bits set in memory area
 * @ptr: pointer to the start of the area
 * @bytes: the size of the area
 */
size_t memweight(const void *ptr, size_t bytes)
{
	size_t ret = 0;
	size_t longs;
	const unsigned char *bitmap = ptr;

	for (; bytes > 0 && ((unsigned long)bitmap) % sizeof(long);
			bytes--, bitmap++)
		ret += hweight8(*bitmap);

	longs = bytes / sizeof(long);
	if (longs) {
		BUG_ON(longs >= INT_MAX / BITS_PER_LONG);
		ret += bitmap_weight((unsigned long *)bitmap,
				longs * BITS_PER_LONG);
		bytes -= longs * sizeof(long);
		bitmap += longs * sizeof(long);
	}
	/*
	 * The reason that this last loop is distinct from the preceding
	 * bitmap_weight() call is to compute 1-bits in the last region smaller
	 * than sizeof(long) properly on big-endian systems.
	 */
	for (; bytes > 0; bytes--, bitmap++)
		ret += hweight8(*bitmap);

	return ret;
}
EXPORT_SYMBOL(memweight);
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