For making things build again:
Acked-by: Mike Looijmans
I'd be interested in use-cases for having nvmem as a module, I cannot think of
I am working on splitting of_get_nvmem_mac_address(), by moving most of its
burden to the nvmem interface. Intend to create this "just give me my bytes"
function in nvmem:
int of_nvmem_cell_read(struct device_node *np, const char *name,
void *buf, size_t bytes);
With that in place, of_get_nvmem_mac_address becomes a one-liner:
return of_nvmem_cell_read(np, "mac-address", addr, ETH_ALEN);
That would allow of_get_nvmem_mac_address to be inlined, and this would move
the link issues into modules that actually use that function.
Which may still be very confusing, since it means that CONFIG_MACB=y with
CONFIG_NVMEM=m will fail, but setting both to "y" or both to "m" will work. So
that would introduce more build failures again, right?
On 04-04-18 12:38, Arnd Bergmann wrote:
The new of_get_nvmem_mac_address() helper function causes a link error
drivers/of/of_net.o: In function `of_get_nvmem_mac_address':
of_net.c:(.text+0x168): undefined reference to `of_nvmem_cell_get'
of_net.c:(.text+0x19c): undefined reference to `nvmem_cell_read'
of_net.c:(.text+0x1a8): undefined reference to `nvmem_cell_put'
I could not come up with a good solution for this, as the code is always
built-in. Using an #if IS_REACHABLE() check around it would solve the
link time issue but then stop it from working in that configuration.
Making of_nvmem_cell_get() an inline function could also solve that, but
seems a bit ugly since it's somewhat larger than most inline functions,
and it would just bring that problem into the callers. Splitting the
function into a separate file might be an alternative.
This uses the big hammer by making CONFIG_NVMEM itself a 'bool' symbol,
which avoids the problem entirely but makes the vmlinux larger for anyone
that might use NVMEM support but doesn't need it built-in otherwise.
Fixes: 9217e566bdee ("of_net: Implement of_get_nvmem_mac_address helper")
Cc: Mike Looijmans <mike.looijm...@topic.nl>
Cc: Florian Fainelli <f.faine...@gmail.com>
Cc: Andrew Lunn <and...@lunn.ch>
Cc: David S. Miller <da...@davemloft.net>
Signed-off-by: Arnd Bergmann <a...@arndb.de>
The problem arrived through the networking tree, but it's now in
mainline, so the fix could go through either tree
drivers/nvmem/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 5f9bc787d634..1090924efdb1 100644
@@ -1,5 +1,5 @@
- tristate "NVMEM Support"
+ bool "NVMEM Support"
Support for NVMEM(Non Volatile Memory) devices like EEPROM, EFUSES...
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