/* * acpi_lpat.h - LPAT table processing functions * * Copyright (C) 2015 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #ifndef ACPI_LPAT_H #define ACPI_LPAT_H struct acpi_lpat { int temp; int raw; }; struct acpi_lpat_conversion_table { struct acpi_lpat *lpat; int lpat_count; }; #ifdef CONFIG_ACPI int acpi_lpat_raw_to_temp(struct acpi_lpat_conversion_table *lpat_table, int raw); int acpi_lpat_temp_to_raw(struct acpi_lpat_conversion_table *lpat_table, int temp); struct acpi_lpat_conversion_table *acpi_lpat_get_conversion_table(acpi_handle handle); void acpi_lpat_free_conversion_table(struct acpi_lpat_conversion_table *lpat_table); #else static int acpi_lpat_raw_to_temp(struct acpi_lpat_conversion_table *lpat_table, int raw) { return 0; } static int acpi_lpat_temp_to_raw(struct acpi_lpat_conversion_table *lpat_table, int temp) { return 0; } static struct acpi_lpat_conversion_table *acpi_lpat_get_conversion_table( acpi_handle handle) { return NULL; } static void acpi_lpat_free_conversion_table(struct acpi_lpat_conversion_table *lpat_table) { } #endif #endif > summaryrefslogtreecommitdiff
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authorColy Li <colyli@suse.de>2017-01-24 15:18:46 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-24 16:26:14 -0800
commitf598f82e204ec0b17797caaf1b0311c52d43fb9a (patch)
tree20e0109db50c168a36df14af76b484eaf9b71836 /include/dt-bindings/pwm
parent4180c4c170a5a33b9987b314d248a9d572d89ab0 (diff)
romfs: use different way to generate fsid for BLOCK or MTD
Commit 8a59f5d25265 ("fs/romfs: return f_fsid for statfs(2)") generates a 64bit id from sb->s_bdev->bd_dev. This is only correct when romfs is defined with CONFIG_ROMFS_ON_BLOCK. If romfs is only defined with CONFIG_ROMFS_ON_MTD, sb->s_bdev is NULL, referencing sb->s_bdev->bd_dev will triger an oops. Richard Weinberger points out that when CONFIG_ROMFS_BACKED_BY_BOTH=y, both CONFIG_ROMFS_ON_BLOCK and CONFIG_ROMFS_ON_MTD are defined. Therefore when calling huge_encode_dev() to generate a 64bit id, I use the follow order to choose parameter, - CONFIG_ROMFS_ON_BLOCK defined use sb->s_bdev->bd_dev - CONFIG_ROMFS_ON_BLOCK undefined and CONFIG_ROMFS_ON_MTD defined use sb->s_dev when, - both CONFIG_ROMFS_ON_BLOCK and CONFIG_ROMFS_ON_MTD undefined leave id as 0 When CONFIG_ROMFS_ON_MTD is defined and sb->s_mtd is not NULL, sb->s_dev is set to a device ID generated by MTD_BLOCK_MAJOR and mtd index, otherwise sb->s_dev is 0. This is a try-best effort to generate a uniq file system ID, if all the above conditions are not meet, f_fsid of this romfs instance will be 0. Generally only one romfs can be built on single MTD block device, this method is enough to identify multiple romfs instances in a computer. Link: http://lkml.kernel.org/r/1482928596-115155-1-git-send-email-colyli@suse.de Signed-off-by: Coly Li <colyli@suse.de> Reported-by: Nong Li <nongli1031@gmail.com> Tested-by: Nong Li <nongli1031@gmail.com> Cc: Richard Weinberger <richard.weinberger@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/dt-bindings/pwm')