linux-kernel - [PATCH] kconfig: fix broken dependency in randconfig-generated .config

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Message-Id: <20200201050311.3458-1-masahiroy@kernel.org>
Date:   Sat,  1 Feb 2020 14:03:11 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH] kconfig: fix broken dependency in randconfig-generated .config

Running randconfig on arm64 using KCONFIG_SEED=0x40C5E904 (e.g. on v5.5)
produces the .config with CONFIG_EFI=y and CONFIG_CPU_BIG_ENDIAN=y,
which does not meet the !CONFIG_CPU_BIG_ENDIAN dependency.

This is because the user choice for CONFIG_CPU_LITTLE_ENDIAN vs
CONFIG_CPU_BIG_ENDIAN is set by randomize_choice_values() after the
value of CONFIG_EFI is calculated.

When this happens, the has_changed flag should be set.

Currently, it takes the result from the last iteration. It should
accumulate all the results of the loop.

Reported-by: Vincenzo Frascino <vincenzo.frascino@....com>
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 scripts/kconfig/confdata.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 99f2418baa6c..eb1efa3abdee 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -1353,7 +1353,7 @@ bool conf_set_all_new_symbols(enum conf_def_mode mode)

 		sym_calc_value(csym);
 		if (mode == def_random)
-			has_changed = randomize_choice_values(csym);
+			has_changed |= randomize_choice_values(csym);
 		else {
 			set_all_choice_values(csym);
 			has_changed = true;
-- 
2.17.1