From patchwork Sun Mar 8 00:11:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eugeniu Rosca X-Patchwork-Id: 243367 List-Id: U-Boot discussion From: roscaeugeniu at gmail.com (Eugeniu Rosca) Date: Sun, 8 Mar 2020 01:11:18 +0100 Subject: [PATCH] image.h: isolate android_image_* functions from tooling Message-ID: <20200308001118.2466-1-erosca@de.adit-jv.com> On Feb. 16, 2020, Tom reported [1] build failure of U-Boot in-tree tooling after applying https://patchwork.ozlabs.org/cover/1229663/ ("[v6,0/7] rsa: extend rsa_verify() for UEFI secure boot"). Later on, Heinrich stressed the urgency of the issue in https://patchwork.ozlabs.org/patch/1250858/#2379069: >>>>>>>>> We should finalize the topic as it stops EFI patches from being merged >>>>>>>>> On the surface, the problem is caused by U-Boot commits [2-3], which employed 'u32' in 'include/image.h', while historically U-Boot tooling stayed agnostic on the {u,s}{8,16,32} types. Thanks to Tom, Yamada-san and Heinrich, the following solutions have been put head-to-head ('+' pros, '-' cons): A. Use an equivalent fixed-size type, i.e. s/u32/uint32_t/ in both android function prototypes (image.h) and definitions (c file): + quick and low-line-count - creates a 'soup' of fixed-sized types in the Android C file - will confuse contributors - is going against Linux kernel best practices [4] B. Guard Android functions by '!defined(USE_HOSTCC)' in image.h: + quick and low-line-count + reflects the reality (no android function is used by tooling) + zero impact on other subsystems - ifdeffery may look annoying (pre-existing problem of image.h) C. Make {u8,u16,u32} available in U-Boot tooling: + quick and low-line-count + [Yamada-san][5]: * forbidding u32 for tools is questionable to me * Linux kernel and Barebox use {u8,u16,u32} for the tools space - breaks U-Boot tradition? - has larger impact than [A] and [B] - adds type complexity/inconsistency in the tooling space D. [Yamada-san] Refactor the headers to minimize the code shared between U-Boot space and tooling space: + probably the long-term solution - high effort - can be seen/done as an incremental update on top of [B] Looking at the above, [B] looks like the natural way to go forward. [1] https://patchwork.ozlabs.org/patch/1238245/#2363052 [2] commit 7f2531502c74c0 ("image: android: Add routine to get dtbo params") [3] commit c3bfad825a71ea ("image: android: Add functions for handling dtb field") [4] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e6176fa4728fb6d ("checkpatch: add --strict warning for c99 fixed size typedefs : int_t") [5] https://patchwork.ozlabs.org/patch/1238245/#2363340 Cc: Masahiro Yamada Cc: Heinrich Schuchardt Cc: Sam Protsenko Cc: Lokesh Vutla Cc: Simon Glass Cc: AKASHI Takahiro Reported-by: Tom Rini Signed-off-by: Eugeniu Rosca Tested-by: Heinrich Schuchardt --- include/image.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/image.h b/include/image.h index b316d167d8d7..645daeea507b 100644 --- a/include/image.h +++ b/include/image.h @@ -1416,6 +1416,7 @@ struct cipher_algo *image_get_cipher_algo(const char *full_name); #endif /* CONFIG_FIT_VERBOSE */ #endif /* CONFIG_FIT */ +#if !defined(USE_HOSTCC) #if defined(CONFIG_ANDROID_BOOT_IMAGE) struct andr_img_hdr; int android_image_check_header(const struct andr_img_hdr *hdr); @@ -1437,6 +1438,7 @@ bool android_image_print_dtb_contents(ulong hdr_addr); #endif #endif /* CONFIG_ANDROID_BOOT_IMAGE */ +#endif /* !USE_HOSTCC */ /** * board_fit_config_name_match() - Check for a matching board name